bootstrap.conf: drop usage of c-strcase gnulib module

Signed-off-by: NPavel Hrdina <phrdina@redhat.com>
Reviewed-by: NCole Robinson <crobinso@redhat.com>

bootstrap.conf

@@ -20,7 +20,6 @@
 gnulib_modules='
 accept
 bind
-c-strcase
 canonicalize-lgpl
 chown
 clock-time